<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="page"></div>
</body>

<style>
    .page {
      margin: 50px auto;
      width: 400px;
      height: 600px;
      padding: 20px;
      box-shadow: inset 0 -48px 48px rgba(0, 0, 0, 0.1), 0 0 0 2px rgb(255, 255, 255),
        5px 5px 16px rgba(0, 0, 0, 0.3);
    }
  </style>
</html>